Rhinitis is a reaction that happens in the eyes, nose, and throat when allergens in the air trigger the release of histamine in the body. Histamine causes itching, swelling, and fluid to build up in the fragile linings of nasal passages, sinuses, and eyelids.
Raynaud's phenomenon is a disorder that causes decreased blood flow to the fingers. In some cases, it also causes less blood flow to the ears, toes, nipples, knees, or nose. This happens due to spasms of blood vessels in those areas. The spasms happen in response to cold, stress, or emotional upset.
|Reactive Arthritis (Reiter's Syndrome)
Reactive arthritis is a type of arthritis that occurs due to an infection. Arthritis is when joints become inflamed and painful. Reactive arthritis is not contagious. It's also known as Reiter's Syndrome. It mostly affects men ages 20 to 40.
|Rheumatic Heart Disease
Rheumatic heart disease is a condition in which the heart valves have been permanently damaged by rheumatic fever. The heart valve damage starts with an untreated or under-treated strep infection. In some cases, strep throat or scarlet fever, which are caused by streptococcus A bacteria, can progress to rheumatic fever if not treated properly.
Detailed information on the most common types of rosacea, including prerosacea, vascular rosacea, inflammatory rosacea, and rhinophyma
Retinitis pigmentosa is the name of a group of eye diseases that are passed down in families. All the diseases involve the eye’s retina. The retina is the nerve layer that lines the back of the eye that is sensitive to light. All the diseases cause a slow but sure loss or decline in eyesight.
Astigmatism is one type of refractive error. It's a condition in which an abnormal curvature of the cornea can cause two focal points to fall in two different locations—making objects up close and at a distance appear blurry.
|Rocky Mountain Spotted Fever
Rocky Mountain spotted fever (RMSF) is an infection caused by the bite of an infected tick.
|Rubella (German Measles)
Rubella, sometimes called German measles, is a viral infection. It usually causes a mild illness in children. Adults have a slightly more severe illness.
|Repetitive Motion Injury
Repetitive motion injuries, also called repetitive stress injuries, are temporary or permanent injuries to muscles, nerves, ligaments, and tendons caused by performing the same motion over and over again.